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drbd: Disable activity log updates when the whole device is out of sync

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When the complete device is marked as out of sync, we can disable
updates of the on disk AL. Currently AL updates are only disabled
if one uses the "invalidate-remote" command on an unconnected,
primary device, or when at attach time all bits in the bitmap are
set.

As of now, AL updated do not get disabled when a all bits becomes
set due to application writes to an unconnected DRBD device.
While this is a missing feature, it is not considered important,
and might get added later.

BTW, after initializing a "one legged" DRBD device
drbdadm create-md resX
drbdadm -- --force primary resX
AL updates also get disabled, until the first connect.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Philipp Reisner 2010-08-31 12:00:50 +02:00
parent d53733893d
commit 0778286a13
8 changed files with 80 additions and 6 deletions
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2
drivers/block/drbd/drbd_bitmap.c
View File

@ -569,7 +569,7 @@ int drbd_bm_resize(struct drbd_conf *mdev, sector_t capacity, int set_new_bits)
*
* maybe bm_set should be atomic_t ?
*/
static unsigned long _drbd_bm_total_weight(struct drbd_conf *mdev)
unsigned long _drbd_bm_total_weight(struct drbd_conf *mdev)
{
struct drbd_bitmap *b = mdev->bitmap;
unsigned long s;

2
drivers/block/drbd/drbd_int.h
View File

@ -863,6 +863,7 @@ enum {
CONN_DRY_RUN, /* Expect disconnect after resync handshake. */
GOT_PING_ACK, /* set when we receive a ping_ack packet, misc wait gets woken */
NEW_CUR_UUID, /* Create new current UUID when thawing IO */
AL_SUSPENDED, /* Activity logging is currently suspended. */
};
struct drbd_bitmap; /* opaque for drbd_conf */
@ -1425,6 +1426,7 @@ extern unsigned long drbd_bm_find_next(struct drbd_conf *mdev, unsigned long bm_
/* bm_find_next variants for use while you hold drbd_bm_lock() */
extern unsigned long _drbd_bm_find_next(struct drbd_conf *mdev, unsigned long bm_fo);
extern unsigned long _drbd_bm_find_next_zero(struct drbd_conf *mdev, unsigned long bm_fo);
extern unsigned long _drbd_bm_total_weight(struct drbd_conf *mdev);
extern unsigned long drbd_bm_total_weight(struct drbd_conf *mdev);
extern int drbd_bm_rs_done(struct drbd_conf *mdev);
/* for receive_bitmap */

12
drivers/block/drbd/drbd_main.c
View File

@ -963,6 +963,12 @@ static void set_ov_position(struct drbd_conf *mdev, enum drbd_conns cs)
}
}
static void drbd_resume_al(struct drbd_conf *mdev)
{
if (test_and_clear_bit(AL_SUSPENDED, &mdev->flags))
dev_info(DEV, "Resumed AL updates\n");
}
/**
* __drbd_set_state() - Set a new DRBD state
* @mdev: DRBD device.
@ -1160,6 +1166,10 @@ int __drbd_set_state(struct drbd_conf *mdev,
ns.conn <= C_TEAR_DOWN && ns.conn >= C_TIMEOUT)
drbd_thread_restart_nowait(&mdev->receiver);
/* Resume AL writing if we get a connection */
if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED)
drbd_resume_al(mdev);
ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC);
if (ascw) {
ascw->os = os;
@ -2851,6 +2861,7 @@ void drbd_mdev_cleanup(struct drbd_conf *mdev)
}
drbd_free_resources(mdev);
clear_bit(AL_SUSPENDED, &mdev->flags);
/*
* currently we drbd_init_ee only on module load, so
@ -3652,6 +3663,7 @@ int drbd_bmio_clear_n_write(struct drbd_conf *mdev)
{
int rv = -EIO;
drbd_resume_al(mdev);
if (get_ldev_if_state(mdev, D_ATTACHING)) {
drbd_bm_clear_all(mdev);
rv = drbd_bm_write(mdev);

54
drivers/block/drbd/drbd_nl.c
View File

@ -777,6 +777,29 @@ static void drbd_reconfig_done(struct drbd_conf *mdev)
wake_up(&mdev->state_wait);
}
/* Make sure IO is suspended before calling this function(). */
static void drbd_suspend_al(struct drbd_conf *mdev)
{
int s = 0;
if (lc_try_lock(mdev->act_log)) {
drbd_al_shrink(mdev);
lc_unlock(mdev->act_log);
} else {
dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n");
return;
}
spin_lock_irq(&mdev->req_lock);
if (mdev->state.conn < C_CONNECTED)
s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags);
spin_unlock_irq(&mdev->req_lock);
if (s)
dev_info(DEV, "Suspended AL updates\n");
}
/* does always return 0;
* interesting return code is in reply->ret_code */
static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
@ -1113,6 +1136,9 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
drbd_al_to_on_disk_bm(mdev);
}
if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev))
drbd_suspend_al(mdev); /* IO is still suspended here... */
spin_lock_irq(&mdev->req_lock);
os = mdev->state;
ns.i = os.i;
@ -1792,12 +1818,38 @@ static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nl
return 0;
}
static int drbd_bmio_set_susp_al(struct drbd_conf *mdev)
{
int rv;
rv = drbd_bmio_set_n_write(mdev);
drbd_suspend_al(mdev);
return rv;
}
static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
struct drbd_nl_cfg_reply *reply)
{
int retcode;
reply->ret_code = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED);
if (retcode < SS_SUCCESS) {
if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) {
/* The peer will get a resync upon connect anyways. Just make that
into a full resync. */
retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT));
if (retcode >= SS_SUCCESS) {
/* open coded drbd_bitmap_io() */
if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al,
"set_n_write from invalidate_peer"))
retcode = ERR_IO_MD_DISK;
}
} else
retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
}
reply->ret_code = retcode;
return 0;
}

3
drivers/block/drbd/drbd_proc.c
View File

@ -203,7 +203,7 @@ static int drbd_seq_show(struct seq_file *seq, void *v)
seq_printf(seq, "%2d: cs:Unconfigured\n", i);
} else {
seq_printf(seq,
"%2d: cs:%s ro:%s/%s ds:%s/%s %c %c%c%c%c%c\n"
"%2d: cs:%s ro:%s/%s ds:%s/%s %c %c%c%c%c%c%c\n"
" ns:%u nr:%u dw:%u dr:%u al:%u bm:%u "
"lo:%d pe:%d ua:%d ap:%d ep:%d wo:%c",
i, sn,
@ -218,6 +218,7 @@ static int drbd_seq_show(struct seq_file *seq, void *v)
mdev->state.peer_isp ? 'p' : '-',
mdev->state.user_isp ? 'u' : '-',
mdev->congestion_reason ?: '-',
test_bit(AL_SUSPENDED, &mdev->flags) ? 's' : '-',
mdev->send_cnt/2,
mdev->recv_cnt/2,
mdev->writ_cnt/2,

7
drivers/block/drbd/drbd_req.c
View File

@ -94,7 +94,8 @@ static void _req_is_done(struct drbd_conf *mdev, struct drbd_request *req, const
*/
if (s & RQ_LOCAL_MASK) {
if (get_ldev_if_state(mdev, D_FAILED)) {
drbd_al_complete_io(mdev, req->sector);
if (s & RQ_IN_ACT_LOG)
drbd_al_complete_io(mdev, req->sector);
put_ldev(mdev);
} else if (__ratelimit(&drbd_ratelimit_state)) {
dev_warn(DEV, "Should have called drbd_al_complete_io(, %llu), "
@ -802,8 +803,10 @@ static int drbd_make_request_common(struct drbd_conf *mdev, struct bio *bio)
* resync extent to finish, and, if necessary, pulls in the target
* extent into the activity log, which involves further disk io because
* of transactional on-disk meta data updates. */
if (rw == WRITE && local)
if (rw == WRITE && local && !test_bit(AL_SUSPENDED, &mdev->flags)) {
req->rq_state |= RQ_IN_ACT_LOG;
drbd_al_begin_io(mdev, sector);
}
remote = remote && (mdev->state.pdsk == D_UP_TO_DATE ||
(mdev->state.pdsk == D_INCONSISTENT &&

4
drivers/block/drbd/drbd_req.h
View File

@ -189,6 +189,9 @@ enum drbd_req_state_bits {
/* Set when this is a write, clear for a read */
__RQ_WRITE,
/* Should call drbd_al_complete_io() for this request... */
__RQ_IN_ACT_LOG,
};
#define RQ_LOCAL_PENDING (1UL << __RQ_LOCAL_PENDING)
@ -208,6 +211,7 @@ enum drbd_req_state_bits {
#define RQ_NET_MASK (((1UL << __RQ_NET_MAX)-1) & ~RQ_LOCAL_MASK)
#define RQ_WRITE (1UL << __RQ_WRITE)
#define RQ_IN_ACT_LOG (1UL << __RQ_IN_ACT_LOG)
/* For waking up the frozen transfer log mod_req() has to return if the request
should be counted in the epoch object*/

2
drivers/block/drbd/drbd_worker.c
View File

@ -1273,7 +1273,7 @@ int w_restart_disk_io(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
{
struct drbd_request *req = container_of(w, struct drbd_request, w);
if (bio_data_dir(req->master_bio) == WRITE)
if (bio_data_dir(req->master_bio) == WRITE && req->rq_state & RQ_IN_ACT_LOG)
drbd_al_begin_io(mdev, req->sector);
/* Calling drbd_al_begin_io() out of the worker might deadlocks
theoretically. Practically it can not deadlock, since this is